<!-- 购物车 -->
<template>
  <div>
    <div class="shopcart">
      <div class="content">
        <div class="content-left" @click="toggleShow">
          <div class="logo-wrapper">
            <div class="logo highlight" :class="{highlight: totalCount}">
              <i class="iconfont icon-shopping_cart" :class="{highlight: totalCount}"></i>
            </div>
            <div class="num">{{totalCount}}</div>
          </div>
          <div class="price highlight">￥{{totalPrice}}</div>
          <div class="desc">另需配送费￥{{info.deliveryPrice}} 元</div>
        </div>
        <div class="content-right">
          <div class="pay" :class="payClass"> {{payText}} </div>
        </div>
      </div>
      <transition name="move">
        <div class="shopcart-list" v-show="listShow">
          <div class="list-header">
            <h1 class="title">购物车</h1> <span class="empty" @click="clearShopCart">清空</span>
          </div>
          <div class="list-content">
            <ul>
              <li class="food" v-for="(food, index) in shopCart" :key="index">
                <span class="name">{{food.name}}</span>
                <div class="price">
                  <span>￥{{food.price * food.count}}</span>
                </div>
                <div class="cartcontrol-wrapper">
                  <CartControl :food="food" />
                </div>
              </li>
            </ul>
          </div>
        </div>
      </transition>
    </div>
    <div class="list-mask" v-show="isShow" @click="toggleShow"></div>
  </div>
</template>

<script>
// 导入 vuex 状态 api
import { mapGetters, mapState } from 'vuex'
// 导入加减按钮
import CartControl from '@/components/CartControl/CartControl'
import BScroll from '@better-scroll/core'
import { MessageBox } from 'mint-ui'
export default {
    data() {
        return {
            isShow: false,
        }
    },

    components: {
        CartControl,
    },

    computed: {
        ...mapState(['info', 'shopCart']),
        // 需要获取到购物车的总数量
        ...mapGetters(['totalCount', 'totalPrice']),
        // 结算按钮的颜色显示
        payClass() {
            const { totalPrice } = this
            const { minPrice } = this.info
            return totalPrice >= minPrice ? 'enough' : 'not-enough'
        },
        // 计算与起算价格相差多少
        payText() {
            // 获取需要的属性 总价格 最小配送费
            const { totalPrice } = this
            const { minPrice } = this.info
            if (totalPrice === 0) {
                return `￥${minPrice} 元起送`
            } else if (totalPrice < minPrice) {
                return `还差￥${minPrice - totalPrice} 元起送`
            } else {
                return '去结算'
            }
        },
        // 是否显示购物车详情
        listShow() {
            // 判断是否显示购物车食品列表
            // 如果当前的购物车内没有食品, 则不进行显示
            if (this.totalCount === 0) {
                this.isShow = false
                return false
            }
            // 如果进行显示
            if (this.isShow) {
                // 这样处理会产生, 购物车详情, 点击隐藏多次之后
                // 点击购物车详情中的 + 号 , 会一次添加多个值
                // 这里原因是什么呢?
                // 思考一下
                // BSCroll 绑定的时候, 其中的事件是由 BSCroll 对象进行分发?
                // 多次点击之后, 相当于创建了多个 BScroll 对象, 多个对象又分别进行事件分发
                // 所以点击一次 将触发多个事件 达到了, 点击一次, 调用多次的情况
                // 解决方法: 可以只保留一个
                // new BScroll('.list-content', {
                //     click: true,
                // })
                // 在界面进行更新之后, 创建当前的食品列表滑动
                this.$nextTick(() => {
                    // 判断当前是否具 scroll 对象
                    if (!this.scroll) {
                        // 如果没有, 给当前的列表进行添加滑动对象
                        this.scroll = new BScroll('.list-content', {
                            click: true,
                        })
                    } else {
                        // 否则刷新当前的 scroll , 因为用户可能添加了新的食品, 数据有所变动
                        // 重新计算滑动
                        this.scroll.refresh()
                    }
                })
            }
            return this.isShow
        },
    },

    mounted() {},

    methods: {
        toggleShow() {
            if (this.totalCount > 0) {
                this.isShow = !this.isShow
            }
        },
        // 清除购物车信息
        clearShopCart() {
            MessageBox.confirm('确定清空购物车吗?').then(
                (action) => {
                    this.$store.dispatch('clearShopCart')
                },
                () => {}
            )
        },
    },
}
</script>
<style lang="stylus" rel="stylesheet/stylus" scoped>
@import '../../common/stylus/mixins.styl';

.shopcart {
  position: fixed;
  left: 0;
  bottom: 0;
  z-index: 50;
  width: 100%;
  height: 48px;

  .content {
    display: flex;
    background: #141d27;
    font-size: 0;
    color: rgba(255, 255, 255, 0.4);

    .content-left {
      flex: 1;

      .logo-wrapper {
        display: inline-block;
        vertical-align: top;
        position: relative;
        top: -10px;
        margin: 0 12px;
        padding: 6px;
        width: 56px;
        height: 56px;
        box-sizing: border-box;
        border-radius: 50%;
        background: #141d27;

        .logo {
          width: 100%;
          height: 100%;
          border-radius: 50%;
          text-align: center;
          background: #2b343c;

          &.highlight {
            background: $green;
          }

          .icon-shopping_cart {
            line-height: 44px;
            font-size: 24px;
            color: #80858a;

            &.highlight {
              color: #fff;
            }
          }
        }

        .num {
          position: absolute;
          top: 0;
          right: 0;
          width: 24px;
          height: 16px;
          line-height: 16px;
          text-align: center;
          border-radius: 16px;
          font-size: 9px;
          font-weight: 700;
          color: #ffffff;
          background: rgb(240, 20, 20);
          box-shadow: 0 4px 8px 0 rgba(0, 0, 0, 0.4);
        }
      }

      .price {
        display: inline-block;
        vertical-align: top;
        margin-top: 5px;
        line-height: 24px;
        padding-right: 12px;
        box-sizing: border-box;
        font-size: 16px;
        font-weight: 700;
        color: #fff;

        &.highlight {
          color: #fff;
        }
      }

      .desc {
        display: inline-block;
        vertical-align: bottom;
        margin-bottom: 15px;
        margin-left: -45px;
        font-size: 10px;
      }
    }

    .content-right {
      flex: 0 0 105px;
      width: 105px;

      .pay {
        height: 48px;
        line-height: 48px;
        text-align: center;
        font-size: 12px;
        font-weight: 700;
        color: #fff;

        &.not-enough {
          background: #2b333b;
        }

        &.enough {
          background: #00b43c;
          color: #fff;
        }
      }
    }
  }

  .ball-container {
    .ball {
      position: fixed;
      left: 32px;
      bottom: 22px;
      z-index: 200;
      transition: all 0.4s cubic-bezier(0.49, -0.29, 0.75, 0.41);

      .inner {
        width: 16px;
        height: 16px;
        border-radius: 50%;
        background: $green;
        transition: all 0.4s linear;
      }
    }
  }

  .shopcart-list {
    position: absolute;
    left: 0;
    top: 0;
    z-index: -1;
    width: 100%;
    transform: translateY(-100%);

    &.move-enter-active, &.move-leave-active {
      transition: transform 0.5s;
    }

    &.move-enter, &.move-leave-to {
      transform: translateY(0);
    }

    .list-header {
      height: 40px;
      line-height: 40px;
      padding: 0 18px;
      background: #f3f5f7;
      border-bottom: 1px solid rgba(7, 17, 27, 0.1);

      .title {
        float: left;
        font-size: 14px;
        color: rgb(7, 17, 27);
      }

      .empty {
        float: right;
        font-size: 12px;
        color: rgb(0, 160, 220);
      }
    }

    .list-content {
      padding: 0 18px;
      max-height: 217px;
      overflow: hidden;
      background: #fff;

      .food {
        position: relative;
        padding: 12px 0;
        box-sizing: border-box;
        bottom-border-1px(rgba(7, 17, 27, 0.1));

        .name {
          line-height: 24px;
          font-size: 14px;
          color: rgb(7, 17, 27);
        }

        .price {
          position: absolute;
          right: 90px;
          bottom: 12px;
          line-height: 24px;
          font-size: 14px;
          font-weight: 700;
          color: rgb(240, 20, 20);
        }

        .cartcontrol-wrapper {
          position: absolute;
          right: 0;
          bottom: 6px;
        }
      }
    }
  }
}

.list-mask {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 40;
  backdrop-filter: blur(10px);
  opacity: 1;
  background: rgba(7, 17, 27, 0.6);

  &.fade-enter-active, &.fade-leave-active {
    transition: all 0.5s;
  }

  &.fade-enter, &.fade-leave-to {
    opacity: 0;
    background: rgba(7, 17, 27, 0);
  }
}
</style>